Most of Romania's law-enforcement efforts are concentrated on its capital, Bucharest, but most of the cases identified during the crackdown originated from smaller towns, where the eBay team sometimes found backlogs of 200 eBay-related fraud cases, Lee said.

Speaking at the e-Crime Congress 2008 in London, Lee said phishing remains the main threat facing eBay users.

But, Lee said, eBay has kept the number of attacks static through educating users about revealing personal details and built-in security measures in new internet browsers.

Lee added that eBay is often successful in tracking down the smaller online criminals but he warned that fighting larger crime networks remains an "uphill battle".